the sudden escape of gas or liquid confined under pressure, such as in a gas or oil well, or in a system containing pressurized air or steam.
An unexpected violent eruption of oil and gas from a well during the drilling phase of operation. This happens when high pressure gas is encountered and the proper precautions have not been taken. The initial eruption is followed by an uncontrolled flow of fluids from the well.
an uncontrolled flow of gas, oil, or other well fluids into the atmosphere or into an underground formation. A blowout, or gusher, can occur when formation pressure exceeds the pressure applied to it by the column of drilling fluid.